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Eric Wrote:

Quote:s13 ca diff housing since it's the smallest and is lighter than the other's

not quite, diff housings are the same on s13 and s14, only difference is the backplate, s13 has 4 bolt, s14 2 bolt.
diff's form s13 and s14 can be swapped easily.

s15 diff has a little difference in driveshaft mounting and other minor stuff.

I don't know what years you had the S13's sold there , here they are all imported and there is Non ABS and ABS car's . The difference is the ABS S13's have a shorter nose diff , maybe by 20mm and also have the ABS wheel speed sensor ring inside the front of the casing . This casing is shorter and more hollow in the nose making for a lighter diff. No idea if there really much difference between the alloy rear housing's since the Non hicas imported here didn't have the oil cooling fin's.

And backplate ? are you talking about drive shaft's ? 5 bolt and 6 bolt .